--- Basalt UI Framework main module.
-- This is the main entry point for the Basalt UI Framework.
-- It provides functions for creating and managing UI elements and handling events.
-- @module basalt
-- @author NyoriE
-- @license MIT
-- @copyright 2025
-- @release 2.0
-- @see elementManager
-- @usage
-- local basalt = require("basalt")
-- local mainFrame = basalt.createFrame()
-- mainFrame:show()
-- basalt.run()

local elementManager = require("elementManager")
local expect = require("libraries/expect")
local errorManager = require("errorManager")

--- The main Basalt instance
-- Contains all core functionality and management functions
-- @type Basalt
-- @field traceback boolean Enable/disable error tracing
-- @field _events table Internal events storage
-- @field _schedule table Internal schedule storage
-- @field _plugins table Plugins storage
-- @field LOGGER table Logging instance
local basalt = {}
basalt.traceback = true
basalt._events = {}
basalt._schedule = {}
basalt._plugins = {}
basalt.LOGGER = require("log")

local mainFrame = nil
local updaterActive = false

--- Creates a new UI element
-- Creates and returns a new UI element of the specified type
-- @function create
-- @param type string The type of element to create (e.g. "Button", "Label", "BaseFrame")
-- @param[opt] id string Optional unique identifier for the element
-- @treturn table The created element instance
-- @see elementManager.getElement
-- @usage
-- local button = basalt.create("Button", "myButton")
-- button:setPosition(5, 5)
function basalt.create(type, id)
    if(id==nil)then id = elementManager.generateId() end
    local element = elementManager.getElement(type).new(id, basalt)
    local ok, result = pcall(require, "main")
    if not ok then
        errorManager(false, result)
    end
    return element
end

--- Creates and returns a new frame
-- @function createFrame
-- @return table The created frame instance
-- @usage local mainFrame = basalt.createFrame()
function basalt.createFrame()
    local frame = basalt.create("BaseFrame")
    mainFrame = frame
    return frame
end

--- Returns the element manager instance
-- @function getElementManager
-- @return table The element manager
-- @usage local manager = basalt.getElementManager()
function basalt.getElementManager()
    return elementManager
end

--- Gets or creates the main frame
-- @function getMainFrame
-- @return table The main frame instance
-- @usage local frame = basalt.getMainFrame()
function basalt.getMainFrame()
    if(mainFrame == nil)then
        mainFrame = basalt.createFrame()
    end
    return mainFrame
end

--- Sets the active frame
-- @function setActiveFrame
-- @param frame table The frame to set as active
-- @return boolean Always returns false
-- @usage basalt.setActiveFrame(myFrame)
function basalt.setActiveFrame(frame)
    mainFrame = frame
    return false
end

--- Schedules a function to be updated
-- @function scheduleUpdate
-- @param func function The function to schedule
-- @return number The schedule ID
-- @usage local id = basalt.scheduleUpdate(myFunction)
function basalt.scheduleUpdate(func)
    table.insert(basalt._schedule, func)
    return #basalt._schedule
end

--- Removes a scheduled update
-- @function removeSchedule
-- @param id number The schedule ID to remove
-- @usage basalt.removeSchedule(scheduleId)
function basalt.removeSchedule(id)
    basalt._schedule[id] = nil
end

-- Internal event handler
-- @local
local function updateEvent(event, ...)
    if(event=="terminate")then basalt.stop() end

    if event:find("mouse") then
        if mainFrame then
            mainFrame:handleEvent(event, ...)
        end
    end

    if event:find("key") then
        if mainFrame then
            mainFrame:handleEvent(event, ...)
        end
    end

    if basalt._events[event] then
        for _, callback in ipairs(basalt._events[event]) do
            callback(...)
        end
    end
end

-- Internal render function
-- @local
local function renderFrames()
    if(mainFrame)then
        mainFrame:render()
    end
end

--- Updates all scheduled functions
-- @function update
-- @usage basalt.update()
function basalt.update()
    for k,v in pairs(basalt._schedule) do
        if type(v)=="function" then
            v()
        end
    end
end

--- Stops the Basalt runtime
-- @function stop
-- @usage basalt.stop()
function basalt.stop()
    term.clear()
    term.setCursorPos(1,1)
    updaterActive = false
end

--- Starts the Basalt runtime
-- @function run
-- @param[opt] isActive boolean Whether to start active (default: true)
-- @usage basalt.run()
-- @usage basalt.run(false)
function basalt.run(isActive)
    updaterActive = isActive
    if(isActive==nil)then updaterActive = true end
    local function f()
        renderFrames()
        while updaterActive do
            updateEvent(os.pullEventRaw())
        end
    end
    while updaterActive do
        local ok, err = pcall(f)
        if not(ok)then
            errorManager.header = "Basalt Runtime Error"
            errorManager.error(err)
        end
    end
end
basalt.autoUpdate = basalt.run

return basalt